Tension mechanism for warp beams



Feb. 10, 1931. A. coRNU TENSION MECHANISM FOR WARP BEAMS Filed May 28. 1928 Patented Feb. 16, 1931 tart-ran STATE ALEXAHD-RE connn, or LE HOUL1VIE,. rnnncn TENSION MECHANISM FOR WARP BEAMS Application filed. May' 28, 1928, SerialNo. 281,218, and in France June 14, 1927.

The invention is concerned with brakes for cylinders, principally warp beams for weaving looms in which a cord. band or other bra-king member is maintained stretched tightly over the cylinder or over a member integral with the cylinder, by the action of a spring generally of the helical type.

The invention relates to braking mechanism of thetype in which the brake can be applied and subsequentl Y released to the same degree of tension without interfering with the tension of the spring employed. In this connection pivoted levers operating in conjunction with the chain or band have been employed to maintain the desired tension on the beam on the subsequent application of the braking medium.

According to the invention the brake is adapted to be applied after releaseto the same degree of tension by means of a device similar to a claw coupling and embodying a movable member and a fixed complementary part having engaging faces adapted to be moved towards and away from each other to produce a braking effect upon the cylinder of the same tension without interfering with the spring adjustment.

Additional construction and arrangement of parts will now be more particularly described in detail with reference to the accompanying diagrammatic drawings which represent an example of the invention and on which similar numerals of reference denote corresponding parts throughout the several views.

Fig. 1 is an elevation of a braking apparatus improved in accordance with this invention in its position with tension applied;

Fig. 2 is an elevation taken perpendicularly to Fig. 1 of the said apparatus in the same position, and

Fig. 3 is a view from the same side as Fig.

2, showing the apparatus in the position in which it is free from tension. 7

According to these figures '1 is the Warp beam of a weaving loom, one of the elements of the frame of which is represented at 2. 3 is the braking device constituted by a brake band fitted round the exterior of the warp beam forming the brake drum. To the band 3 is hooked a rod 4 threaded at its lower extremity and over which isfitted a sleeve 5 with base 6, a helical spring 7 being arranged about the rod 4 and interposed between the base 6 and the hub of the wheel 8, the latter acting in the capacity of a nut and being threaded on the rod 4 for adjusting. the tension of the spring 7. l r The device which provides, after the bea brake has" been released, for the said brake being re-applied instantaneously and without efiort to a degree of tension strictly the same as previously applied, without operating the adjusting members, comprises an intermediary member supporting the spring and movable in relation to a fixed member, on which the said intermediary member itself rests, the displacement of the movable member, which displacement permits of the expansion of the spring and of its compression again at will, being based on a principle similar to that of couplings of the claw type. The fixed member is constituted by an upper block 9 of cylindrical form, which axially houses the sleeve 5 and is integral with a support 10 itself fixed so as to be ad-- justable on a member ll'fitted on the frame 2 cf the loom. The block 9 is notched in two planes 12 and 12 so as to constitute a 1nemby a lower rotatable block 13 of cylindrical form and in contact with which, applied the spring-7, is the base 6 of the sleeve 5 which is relatively disposed in an axial direction. This block 13 is notched in a cor respondingly inverse 'manner in planes 14 and 14 so as to constitute a part similar to he male portion of a block or coupling. The rotation of the block 13 round the sleeve 5 is effected through a manipulating lever 15 fixed ina lower projection 16 of the block 13..

On the upper fixed block 9 can be provided a stop 17 whereby the rotary movement of the block 13 which for this purpose is provided with a catch abutment 18, can be precisely limited. Further provision can be made for a second catch, symmetrically disposed in relation to the catch 18, which fulllli) fils the same purpose of a stop in case the manipulating lever 15, is fitted on a projection 16 diametrically opposite the block 13.

Having particularly described the elements of the device, a clear conception of its operation can be gained.

With the blocks 9 and 13 occupying the positions shown in Figs. 1 and 2, the brake is in its applied position, the degree of power being regulated by the manipulation of the wheel 8. The base 6 of the sleeve 5 under the influence of the spring 7 comes against block 13 which rests by the upper ridge of its double bevelled port-ion againstthe points or upper extremities of the notching of the fixed block 9. When it is desired to release the power on the brake, as, for instance for unweaving operations, it is only necessary to give a quarter turn from left to right to the rotary block 13 through the manipulating lever 15 to bring these members into the position represented in Fig. 3. This instantaneous manipulation, which does not require any appreciable effort, causes the'fitting together of the inversely notched portions and causing the two blocks 13 and 9 to engage one in the other, after the manner of the engagement of a claw coupling, so that the spring 7 expands. Inasmuch as the spring is disposedbetween the base 6 of the bushing 5 and the hub of the fly-wheel 8 the bushing 5 is moved upwardly carrying the lower mem ber 18 with it. The tension of the spring is adjusted by actuating the fly-wheel 8. The compression of the spring increases in the braking action as is apparent.

The operation completed,the spring 7 is again pressed by an inverse manipulation of the lever 15 instantaneously and without much effort, whereby .the block 13 resumes its original position, its displacement being precisely limited by the catch 18 acting against the stop 17 so that the spring is compressed to exactly the same extent as previously.

,What I claim is: v

1.. Tension mechanism for warp beams including in combination a braking apparatus, a support, recessed cam member fixed relative to the'support, a brake actuating rod member slidable through the fixed cam member having one end operatively and detachably attached to the braking apparatus, another recessed cam member rotatably and slidably mounted with respect to the rod member and having its recessed face cooperating with the recessed face of the fixed cam member so as to vary the position of the rod member with respect to the fixed cam member and permitting of a brake applying movement of the rod member, and resilient means on the rod acting against the rotatable recessed member for effecting a brake releasing movement of the rod.

2. Tension mechanism as claimed in claim the 1, wherein means is adjustably mounted on the rod member for regulating the tension of the resilient means.

3. Tension mechanism as claimed in claim 1, wherein a bushing is slidable on the rod member and freely receives the rotatable recessed member, a handle attached to the recessed rotatable member to facilitate rota tion thereof, and cooperative stop means on said recessed cam members for limiting the relative rotational movement thereof.

In testimony whereof I ailix my signature.

ALEXi-KNDRE COR-NU. 

